Plant for removing water from pulp in wood-pulp mills.



. P. c. suHAA-NN1NG. PLANT FOB BBMOVING WATER FROM PULP IN WOOD ULP MILLS.- PPLLOATIOF FILED DEO. 9, 1913.'

1,094,378; BatendApr-21, 1914,.

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l u LLLlJ` l l i InvEn-'tniw' P.- E- S chu. anning' FEDER CHRISTIAN SCHiAANNING, QF CHRISTIANIA, NORWAY.

PLANT ron REMovINe WATER rnoM PULP In woon-PULP MILLS.

' Specification of Letters Patent.

` Patented Apr. 21, 1914.

v'Il mglicau-n meereeember 9,1913; seriamasoassa To' all whom it may concern Be it known that I, PEDER- CHRISTIAN Scimnrrnrrtafa-.subject ofthe Kingdom of Norway, and residing at Baekkelaget,`pr. s Christiania, Norway, have invented certain newy and useful Improvements in Plants 4for Removing Water from Pulp ,in- Wood-Pulp Mills, of which the following is a full, clear, and exact description, reference being made to the accompanying drawing, which shows one Vform of plant embodying the "improvements I The objects of this invention are, to speedily remove water from the pulp, and to reduce the cost of erection and of maintaining a plant'of the desired character. rlhe pulp discharged from apparatus is diluted with water, generally in the proportions offrom l part ofulp to G-700 parts'of water. This hash i. strainers operating without suction. Pulp of amaterially higher degree' ofv concentra-- tion will notbe satisf actoril y' deposited on degree of concentration up to. 1 part. of

I pulp to 100 parts of water without ceiling itself or falling from the strainer. In takingr` advantage of this fact, Isubject the 1 pulp to the action ofjwater-removing means',

beforethe pulp reaches a suction-strainer.

the 'present case, thewater-removing apl paratus may comprise 'a series or succession of strainers which remove a substantial portion of the water, .reducing the proportions .from 1.-(500to, for'insta-nce, 1.100, in which latter conditions the pulp will then be 'subj'ected to the action of asuction-strainer, for

a yfinal water-removing operation. 'I 'he -resulting benelits are, considerable inereasein productiveness of the suctlon-strainers, and reduction in cost of construction and of operation and :for attendance.

u l l indicates a pipe or chute, leading'from the succession) of water-removing strainers, 3,

ilatter lifts large 5, to a pump,

the grinding -I een Athe apparatus into a river olf-other of apparatus requires i omy resulting from a strainers (known .stantly walk to and Referring to the accompanying drawing,

l one workman cares are shown as dipp' g into the diluted pulp in the basin. o Cylindrical revoluble strainers are shown; and during the motion of the pulppast thesev strainers, each of the quantities of water, containing t'arinaceous pulp matter, andthe water thus removed i's caught in the chutes or troughs, 4, to be led oli' through a pipe, 6, destined to raise the water through a pipe, 7, preferably for re-use in dilution of pulp, The removal of water from the pulp by the succession of strainers, 3,' graduallyy concentrates the pulp, so that, at the discharge. end, 8, of the basin, the pulp may have reached a dilution of, for instance, 1 part pulp to 100 parts n this concentrated condition, the pulp is fed or led into a receptacle, 10, for a suction-strainer, 9. `The pulp, freed from much farinaceous. matter and water, quickly forms as al coat on the wire of the'suctionstrainer, to hold back farinaceous matter' from a discharge' pipe 11. As a v result, substantially pure water is discharged from point.

noted that the illustrated form pumping of, separated water only the distance represented by itl, not the entire height represented by It is to be H-thus savlng .the power` otherwise called` for to raise the water Y to 5 meters) represented'by k2.

As an example of, the'comparative econplant made according to my invention, itis' pointed ont that a grinding mill emplo 'as Gaara strainers with aproductiveness o six tons, for removing water,.requires iive attendants per working periodopten workmen in each twenty-four hours`while a plant of like capacity with t e. substitution' of suctionstrainers reduces the number of these to two with six water-'removlng strainers in addiying ten ordinary I the distance (from 3 Y tion), and thenumber of worlnnen to .two

or" each working-period, or fourfo'r each twenty.-four hours; In'the first case, itis diflicult for an attendant to manage more than two machines, requiring him to ooni fro to attend to them alternately, while in the vsecond case, waterremoving stfrainers require no attendance strainers. Additional economies are attained with respect to space and first cost,

two pulp-m kingA machines being required for two suctionas against ten of the older kind, six waterremoving strainers, in a common wooden box, and two suction-strainers, less space and being considerably cheaper to construct and maintain than ten 4,ordinary strainers in separate boxes. ous that the consumption of fittings (for 4 instance, the consumption of felt) will lbe highly reduced. Another advantage resulting from this invention, in rebuilding old grinding mills', is that-old strainers can be employed as water-removing strainers, reducing the rebuilding expenses much lower than if a large'number o exclusively 16 suction-strainers were required.

l claim: 1. ln a plant for removing water from pulp in wood pulp mills, a-substantially horizontal reservoir, means to feed highly 20 diluted pulp thereto, a series of water removing strainers arranged in tion in said reservoir, a receptacle at the outlet end ci the reservoir spaced therefrom occupying lt is also obvispaced relaand communicating therewith, a suction strainer in said receptacle, a drain pipe communicating with the series of strainers, and a water lifting pump in connection with 'the drain pipe.

2. In a plant for removing water from pulp in Wood pulp mills, a substantially horizontal reservoir, means to feed highly diluted pulp thereto, a series of water removing strainers arranged in spaced relation in saidl reservoir, a. receptacle at the outlet end of therewith, a suction. strainer in said receptacle, and means for drainingwater from said series of strainers. Intestimony whereof have signed my name to this specification in the presence of. 40 two subscribing witnesses.

rEDER CHRISTIAN SGHAANNING. Witnesses:

M. E. GUTrERMsEN, RUTH LINDSTROM.

the reservoir communicatingl 

